High-performance phosphorus adsorbent based on concrete sludge

A. Iizuka, H. Yoshida, Y. Hayakawa

Research output: Chapter in Book/Report/Conference proceedingChapter

4 Citations (Scopus)


This chapter describes the high-performance phosphorus adsorbent, PAdeCS®, which is produced from concrete sludge. The concrete sludge is a slurried, strong alkali waste that is generated in a concrete pole and pile manufacturing plant in Japan. PAdeCS® is a powdery granulate that can be used as a phosphorus-recovery agent for dissolved phosphate. The precipitation of hydroxyapatite is the dominant mechanism for phosphate removal from aqueous solution by PAdeCS®. Because of the high calcium content of PAdeCS®, the recovered phosphorus product can be used as a slow-release phosphorus fertilizer. The phosphorus-removal performance of PAdeCS® was compared with that of conventional phosphorus-removal agents such as polyferric sulfate, aluminum polychloride, and aluminum sulfate. PAdeCS® showed the highest phosphorus-removal performance among them. PAdeCS®, which is produced from concrete sludge, can be used widely as an inexpensive phosphorus-recovery agent.

Original languageEnglish
Title of host publicationPhosphorus Recovery and Recycling
PublisherSpringer Singapore
Number of pages8
ISBN (Electronic)9789811080319
ISBN (Print)9789811080302
Publication statusPublished - 2018 May 25


  • Concrete sludge
  • Ettringite
  • Fertilizer
  • Hydroxyapatite
  • PAdeCS®
  • Phosphorus adsorbent

ASJC Scopus subject areas

  • Environmental Science(all)
  • Engineering(all)
  • Chemical Engineering(all)


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